There is a list of causes, ranging from newer roads to tire wear to bad alignment. Drive a gravel road to eliminate that possibility. I would guess, however, that your tires are not wearing evenly...rotate the tires. There should be a pattern for rotation in your owner's manual.
Check wheel bearings.
There can be a slight humming noise while driving a neon. This sound could come purely from the engine to indicate that it is running.
Bad wheel bearing
Wheel bearing.
it could be your tires on the pavement.
If the car is straight drive check the transmission fluid for full. Check the u joints on a rear wheel drive. Look for any loose parts on the exhaust system as well to try and find the humming problem.
The question you are asking is the same as a question like: Is building a house? or Is driving a car? You can built a house, you can drive a car and you can surely sing or hum a melody! Is singing or humming a melody, the act itself is not! But depending on what you are humming or what you are singing, the part that comes out of your mouth can be a melody...
humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird humming bird
because something is about to break.
Could be a bearing going bad.
Not a continuous source of sound. A vehicle alarm siren is usually is intermittent
if its while your driving it could be wheel bearings